ENGELMANN—NORTH AM. SPECIES OF JUNCUS. 487 
number of species were sent by Messrs. Bolander and Kel¬ 
logg of California, Ravenel of South Carolina, and Bigelow of 
Michigan, and after them by Messrs. Porter and Smith of 
Pennsylvania and Chapman of Florida. My own and the 
whole botanical fraternity’s acknowledgments are due to all 
of them. 
The 99 numbers comprise 38 different species — among 
them 10 described here for the first time and 12 very rare or 
critical ones—and 20 important varieties; the balance con¬ 
sist of minor varieties, different forms of the same species or 
variety, and in a few instances the same plant from different 
localities. The specimens are not all of equal value or beau¬ 
ty, in some few instances they are inferior, or the different 
specimens of the same number are sometimes not sufficiently 
homogeneous for a collection that claims to be a standard 
one; but on the whole they will be found satisfactory, and 
many of them very perfect and better and more complete 
than they can be found in most herbaria. If my friends or 
the friends of botany in this country will undertake the labor 
of collecting and sending me specimens of the Junci not at 
all or only incompletely represented in the Herbarium Nor- 
male, I will cheerfully promise to do my best to arrange and 
distribute them in the same manner as in the present collec¬ 
tion. I would, in this case, urge the importance of getting 
not only those species that are wanting in the Herb. Norm., 
but especially the intermediate and doubtful forms, that con¬ 
nect the different forms of such polymorphous species as J. 
scirpoides or J. Canadensis and similar ones. 
ADDITIONS AND CORRECTIONS. 
Pag. 425. Among the vegetative organs, the rootstock (not 
root-stalk, as misprinted) has been barely mentioned, while it 
is a most important organ and exhibits many differences in the 
different species of perennial Junci. Very few of our species 
are annuals, and these all belong to the section gramimfolii: 
J. bufonius , triformis , Kelloggii , and, I believe, repens. The 
others bring forth buds from the axils of the lowest scaly 
leaves ( Niederblaetter ) at or soon after the period of flower¬ 
ing, and especially at the time the fruit ripens, in the form of 
short leaf-buds or stolons or horizontal rhizomas, which pre¬ 
serve the existence of the plant through winter while the old 
stock is decaying, and in the following season produce the 
new flowering stalks and die themselves in the succeeding 
summer or fall when their successors are forming, so that the 
living part of the plant never gets more than a year old; but 
in most species the rhizoma, often bearing the vestiges of the 
decayed flowering stems, continues to exist much longer, at- 
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